BU33UV7NUX is a synchronous buck-boost convertor with low power consumption and provides a power supply for products powered by either two-cell alkaline/ NiCd/ NiMH or one-cell Li-ion or Li-polymer battery. Output currents can go as high as 500mA while using two alkaline, and discharge it down to 1.8 V. BU33UV7NUX has reset circuit. (Detection voltage:1.5 V, Release Voltage:1.9 V) BU33UV7NUX output voltage is fixed 3.3V by internal resistor divider. Vout is connected with Vin when VIN voltage is higher than 3.3 V.

Synchronous Boost DC/DC Converter
Iomax500mA @Vout=3.3V, Vin=1.8V (Ta=25°C)
Disconnect Function during EN-OFF and UVLO
Auto-PFM/PWM (MODE=H(=VIN)),
FIXED PFM (MODE=L(=0V))
Reset Function (Detect Voltage = 1.5V)
Pass-Through Function (VIN > VOUT)
Thermal Shutdown
10-pin “VSON010X3020” package